Commit 540ccaa2 authored by Dan Williams's avatar Dan Williams
Browse files

libnvdimm/label: Define CXL region labels 



Add a definition of the CXL 2.0 region label format. Note this is done
as a separate patch to make the next patch that adds namespace label
support easier to read.

Reported-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163116431893.2460985.4003511000574373922.stgit@dwillia2-desk3.amr.corp.intel.com


Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 999c993a

drivers/nvdimm/label.h

+32 −0
Original line number Diff line number Diff line
@@ -66,6 +66,38 @@ struct nd_namespace_index { 
	u8 free[];

};



/**

 * struct cxl_region_label - CXL 2.0 Table 211

 * @type: uuid identifying this label format (region)

 * @uuid: uuid for the region this label describes

 * @flags: NSLABEL_FLAG_UPDATING (all other flags reserved)

 * @nlabel: 1 per interleave-way in the region

 * @position: this label's position in the set

 * @dpa: start address in device-local capacity for this label

 * @rawsize: size of this label's contribution to region

 * @hpa: mandatory system physical address to map this region

 * @slot: slot id of this label in label area

 * @ig: interleave granularity (1 << @ig) * 256 bytes

 * @align: alignment in SZ_256M blocks

 * @reserved: reserved

 * @checksum: fletcher64 sum of this label

 */

struct cxl_region_label {

	u8 type[NSLABEL_UUID_LEN];

	u8 uuid[NSLABEL_UUID_LEN];

	__le32 flags;

	__le16 nlabel;

	__le16 position;

	__le64 dpa;

	__le64 rawsize;

	__le64 hpa;

	__le32 slot;

	__le32 ig;

	__le32 align;

	u8 reserved[0xac];

	__le64 checksum;

};



/**

 * struct nd_namespace_label - namespace superblock

 * @uuid: UUID per RFC 4122